Inspiron 7566 upgrade

I want to upgrade this notebook DELL Inspiron 7566: insert new RAM, and  insert new ssd.
Service Tag: .
1. What RAM frequency does this notebook support? Can I use 2666 mhz? 

2. What ssd does this notebook support? Can I see the list of supported ssd? Or at least one supported ssd model?
What form-factor of ssd is supported? 2242, 2260 or 2280?

What interface of ssd is supported? PCI-E or NVMe?